Focusing device for electric lamps.



0. & c. KUBZ. FOCUSING DEVICE FOR ELECTRIC LAMPS.

APPLICATION FILED APR. I. I918- 1,292,616, Patented Jan. 28, 1919. I

ATTQRNEY OTTO K'UBZ AND CHARLES KURZ, OF NEW YORK, N. Y.

FOCUSING DEVICE FOR ELECTRIC- LAMPS.

, To all whom it may concern:

Be it known that we,"OTTO KURz and CHARLES Kunz, both citizens of theUnited States of. America, residing at New York city,Bronx county, Stateof New York, have invented certain new and useful Improvements inFocusing Devices for Electric,

' Lamps, of which the following is a full,

clear, and exact description.

This invention has for object to pro vide a focusing device forelectric-lights, that is to say, a device to adjust a reflectorrelatively-to an electric lamp to obtain the best results from saidlamp. To focus the rays of light, we provide a special arrangement. ofparts to impart a longitudinal movement to the reflector, that is tosay, a longitudinal movement relatively to the axis of the lamp, whereby'theposition of the lamp andreflector can be changed relatively to eachother.

i A preferred mechanism for mechanically producing the abovenaJmedresults will hereinafter be set the accompanying drawing, wherein Figure1 is a side elevation of an electric lamp made in accordance with ourimprovement, but broken away to illustrate the supv of the 'socket' '9.

port for the lamp-socket;'

Fig. 2 -'s a sectional front elevatlon, the section being taken. 'on avline 22 in Fig.1;

Fig. 3 is a detail side elevation of the reflector and cam-ringtherefor;

Fig. 4 is a fragmentary detail perspective view of a portion of thereflector; I

Fig. 5 is a similar view of a portion ofthe Fig. 6 is a I of the casing,cam-ring and reflector assembled.

As has been stated, the object of our invention is to adjust a reflectorrelatively to its lamp to focus the rays of light. As herein embodiedour improvement consists of a suitable casing/Ito house a movablereflector 8 and a fixed lamp-socket 9 to support a lamp 10. The socket 9will be held fixed by a suitable support, such for instance as isindicated by 11. The reflector '8 will be provided with an opening 12located centrally thereof for the passage therethrough The reflector 8will be I Specification of Letters Patent. Application filed April1,1918. Serial No. 225,932.

forth, reference being had to Patented Jan. 28, 1919.

movably mounted within the casing,that .is to say, mounted formovementlongitudi:

'nally of the axis of the casing 7." To actuate the reflectorlongitudinallyof the casing, we provldea ring l3.l 1av1ng angular or camslots 14, sa1d ring bemg loosely fitted over the flange 15 of thereflector 8, that is to say,

the cam-ring is rotatably mounted upon the flange of the reflector. 1

To prevent rotation of the reflector 8, when its cam-ring is rotated, weprovide same with pins 16 which engage longitiulinally disposed slots 17in the flange 18 of provided with transversely disposed slots j thecasing 7. The casing'flange is further 14* through which locking-screws19 pass, 7

which screws lock the cam-ring 13 to a rotatable collar 20 carried byandmounted exteriorly of the flange 18 of the casing 7. As can be seen inFig. 6, the binding-screws which are carried by the collar 20 passthrough the transverse slots 14* and engage the cam-ring l3; hence whenthecoll ar 20 is rotated the cam-ring 13 will also be rotated, therebycausing the reflector 8-to be moved longitudinally of the lamp casing.

The pins-16 carried by the'reflector will,.

when the cam-ring is rotated, move longitudinally of the slots 17, butthe reflector will not be rotated. The casing 7 will be fixed relativelyto the rotatable collar 20 and cam-ring L3. 3

It will be apparent that the focusing of the rays of light isaccomplished by manipulating the collar 20 to move the reflectorlongitudinally of the casing 7. e

What we claim as our invention is:

1. In an electric lamp, a casing having transversely located-slots, areflector within the casing, a ring having angularly disposed slotsrotatably mounted on said reflector, means carried by the reflector toengage sa1d slots, a rotatable collar carried by the"casing,. andconnecting means passing through saidcollar and through the transverseslots-in the casing to engage said ringwhereby' said collar andring willbe rotated in unison, for the purpose set forth. v

.2. In an elect1'ic-l=amp,'a casing, a fixed bulb-socket carriedthereby, a reflector pro vided with an opening located centrallythereof, said socket being located within said "opening and having aslidable engagement SigneH at-INeW Ycrk city, N. Y., this 3O therewithmeans t9 slidably connect the casdayof March, 1918.

ing and reflecton a'rotatable ring unsecured OTTO KURZ.

' t0 the reflector but connected therewith, and CHARLES KURZ. I

means carried by the reflector cobperating Witnesses: r v With'SLid ringto adjust the reflector longi- MAURICE BLOCK;

tudinally of the casing.

'EDWARD A. JARVIS.

